I tried to argue by explaining how good his kit was and i got told that he wasn't scaling well on his ratios , which i agreed but added that his utility scale hard...but yeah , people are close minded.

Let's don't look at pro players. In general, jayce can be very niche because either you have dmg but no defense or you just lack dmg when building defense cdr. More about when you play him in solo q or normal he just need way too much communication in teamfight and understanding of your team com. Communication is the hardest thing in league currently.